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copied!<p>this would do it</p> <pre><code><?php /** * function isUsPhone * {arg} $num string the number * {returns} bool **/ function isUsPhone($num){ // for au use this // foreach(array('+', '0011') as $c){ foreach(array('+', '00') as $c){ if(substr($num,0,strlen($c)+1) == $c.'1'){ foreach( array( 205, 251, 256, 334, 659, 938, 907, 250, 480, 520, 602, 623, 928, 327, 479, 501, 870, 209, 213, 310, 323, 341, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 627, 628, 650, 657, 661, 669, 707, 714, 747, 760, 764, 805, 818, 831, 858, 909, 916, 925, 935, 949, 951 , 303, 719, 720, 970 , 203, 475, 860, 959, 302, 202, 239, 305, 321, 352, 386, 407, 561, 689, 727, 754, 772, 786, 813, 850, 863, 904, 941, 954 , 229, 404, 470, 478, 678, 706, 762, 770, 912 , 808, 208, 217, 224, 309, 312, 331, 447, 464, 618, 630, 708, 730, 773, 779, 815, 847, 872, 219, 260, 317, 574, 765, 812, 319, 515, 563, 641, 712 , 316, 620, 785, 913, 270, 364, 502, 606, 859, 225, 318, 337, 504, 985, 207, 227, 240, 301, 410, 443, 667, 339, 351, 413, 508, 617, 774, 781, 857, 978 , 231, 248, 269, 313, 517, 586, 616, 679, 734, 810, 906, 947, 989 , 218, 320, 507, 612, 651, 763, 952, 228, 601, 662, 769, 314, 417, 557, 573, 636, 660, 816, 975, 406, 308, 402, 531, 702, 775, 603, 201, 551, 609, 732, 848, 856, 862, 908, 973 , 505, 575, 212, 315, 347, 516, 518, 585, 607, 631, 646, 716, 718, 845, 914, 917, 929 , 252, 336, 704, 828, 910, 919, 980, 984 , 701, 216, 234, 283, 330, 380, 419, 440, 513, 567, 614, 740, 937, 405, 539, 580, 918, 458, 503, 541, 971, 215, 267, 272, 412, 445, 484, 570, 582, 610, 717, 724, 814, 835, 878 , 401, 803, 843, 864, 605, 423, 615, 731, 865, 901, 931, 210, 214, 254, 281, 325, 361, 409, 430, 432, 469, 512, 682, 713, 737, 806, 817, 830, 832, 903, 915, 936, 940, 956, 972, 979 , 385, 435, 801, 802, 276, 434, 540, 571, 703, 757, 804 , 206, 253, 360, 425, 509, 564, 304, 681, 262, 274, 414, 534, 608, 715, 920, 307 ) as $a ){ if(substr($num,strlen($c)+1,3) === (string) $a){ echo "\n".substr($num,strlen($c)+1,3)."\n"; return true; } } } } return false; } var_dump(isUsPhone('+18003343423')); ?> </code></pre> <p>"us" is us now this an no toll, tollfree, or special numbers</p> <p>acc to <a href="http://en.wikipedia.org/wiki/List_of_country_calling_codes" rel="nofollow">wikipedia</a> b.t.w. as you have a uk number, us will always have a prefix (otherwise the call itself would not be possible)</p>

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